Choke-wire conduit



YH Dw m N 0 NE m w m J m Oct. 11, 1932.

Filed Dec. 23, 1931 HNVETNTQR ff NNEZDK EPHA.

Patented Oct. 11, 1932 UNITED 'STATES PATENT OFFICE JOSEPH A. KENNEDY, OI PAWTUCKET, RHODE ISLAN D, ASSIGNOR TOANAOONDA WIRE & CABLE COMIANY, 01 NEW YORK, N. Y., CORPORATION OF DELAWARE CHOKE-WIRE CONDUIT Application Med December 23, 1981. Serial No. 582,761.

. This invention relates to means for slidably guiding a so-called choke-wire adapted to be connected with an arm for actuating a valve controlling the air intake to an automobile carburetor.

The invention will be fully apparent from the following detailed disclosure when read in connection with the accompanying drawchoke-wire and my improved flexible tubular guide therefor;

Fig. 3 is a greatly enlarged view illustrating a choke-wire and the interior construction Fig. 2;

of the guide tube therefor;

. Fig. 4 is a cross section on line 4-4 of Fig. 5 is a longitudinal section through the guide conduit for the choke-wire.

Referring in detail to the drawing, 10 rep resents any conventional form of automobile carburetor and 12 an operating arm adapted to control the opening and closing movement of a butterfly valve or similar conventional valve which controls the air inlet to the carburetor. This type of valve is commonly known in the art as a choke valve because it is frequently used to choke off the supply of air to the carburetor upon starting of the engine. It is broadly old to actuate such an arm by means of a slidable wire. But, in the structures heretofore used, so far as I 'am aware, the choke valve operating wire has been encased or guided in a metallic sheath of some sort such as a solid. metal tube, or

even a flexible metal tube of a form resembling a wire spring having many contacting helical convolutions.

My improved choke-wire assembly is relatively less ex ensive to manufacture. Its guide conduit as no metallic parts.

The improved choke-wire guide includes an inner lining of relatively heavy paper, say, for example, about of an inch in-thickness, which is formed by wrapping a narrow view in side elevationstrip of such paper longitudinally about the spindle of a circular tube forming loom spindle so that the edges of the paper strip make a butt joint extending longitudinally of the tubular lining.

Over this tube, there is tightly woven a jacket composed of a multiplicity of longitudinally extending cotton warp strands and interconnected helical weft or filling strands.

These cotton or fibrous strands, in the process of manufacture, are impre ated with a varnish which tends to stiffen t e strand structure and also in a measure to act as a bond between the strands and the inner paper tube. After the weaving and impregnating operation, the conduit has applied thereto one or more coats of an oil resistant material. Va-- rious materials may be; used for this purpose and by way of example, but not limitation, I

sometimes use a cellulosic lacquer.

In the drawing, it will be noted that the choke-Wire 14, which is usually a relatively stiff yet flexible steel wire, is of a diameter slightly smaller than the interior of the paper tube 16. This tube, as shown best in Fig. 3, is formed of a strip of paper which before being applied is substantially flat, as indicated at 18 in the drawing. In the course of manufacture, as explained above, the edges 20-22 are brought into abutment so as to form the longitudinally extending joint 24. The woven sheath for holding the paper lining is indicated at 26 and the varnish or stiffening material indicated at 28, the lacquer or other destructive agents, usually present in the vicinity of an automobile engine, by a fibrous jacket having the outer oil proofing coating referred to. The described conduit can be made on conventional types of circular looms and can thus be cheaply manufactured in great length and from materials which are relatively much less expensive than the metal guide tubes heretofore used for guiding choke-wires.

The wall thickness of the paper tube is relatively much greater than that of the woven or stranded jacket. The thick paper tube serves as a smooth wear resistant lining for theslidable choke-wire and the thin cotton strands effectively hold the abutting edges of the paper tube stock in proper tight engagement. Some of the varnish applied to the cotton strands in the course of manufacture reaches the surface of the paper and serves in a measure to stiffen the latter. The

aper stock of which the tube is formed may be a single heavy ply or of laminated or multiple ply structure.

The detailed description and the. drawing forming part of the disclosure are to be construed in an illustrative rather than a limiting sense and the claims are to be interpreted as broadly as is consistent with the disclosures of the prior art.

What I claim is '1. A choke-wire assembly comprising a carburetor having an air choke valve carrying an operating arm, a Wire connected thereto adapted to be shifted in opposite directions toactuate the choke valve,'and a guide for the choke-wire comprising a relatively thick walled paper tube within which the wire is slidably mounted and a relatively thin fibrous woven sheath having an oil resistant coating.

2. A choke-wire assembly comprising a carburetor having an air choke valve carrying an operating arm, a wire connected thereto adapted to be shifted in opposite directions to actuate the choke valve, and a guide for the choke wire comprising a paper tube, whose inside diameter is slightly greater than that of said wire and a fibrous woven sheath embracin the tube, said sheath being impregnate with an air drying varnish and havlng an outermost oil resistant coating.

3. A slidable guide for a choke-wire comprising a heavy gauge paper tube with a longitudinally extending butt joint and a sheath therefor comprising interconnected strands of fabric having an outer oil resistant coating, the thickness of said strands being much less than that of said paper tube and the inside diameter of the tube being only slightly greater than that of the chokewire.

' 4. A slidable guide for a choke-wire com prising a heavy gauge paper lining with a butt joint extending longitudinally thereof and a sheath of interconnected fibrous strandsholdingthe conti ous edges of said lining 111 abutting relatlonship, the thickness ofsaid paper lining being relatively thickerthan said strands. w

- 5. A stiff flexible ,metal wire slidably mounted in a conduit comprising relatively thin woven fibrous strands enclosing a lining tube havi'ngan inside diameter only slightly greater than the diameter of said wire, said tube being formed of a relatively thick longitudinal paper strip bent around until its longitudinal meeting edges make a butt joint.

6. A stiff flexible metal wire slidably mounted in a conduit comprising relatively thin woven cottonstrands enclosing a relatively thick lining formed of a longitudinal paper strip bent around until its longitudinal meeting edges make a butt joint, said strands having a varnish-like stiffening material incorporated therein and an outer oil resistant protective coating for said conduit.

7. A guide conduit of'the character described comprising a paper tube having a longitudinally extending joint, a sheath of interwoven cotton strands impregnated with varnish and having an outer coating of lacquer or the like adapted to protect the fibers against the destructive action of oil or water.

In witness whereof, I have hereunto signed my name.

JOSEPH A. KENNEDY. 

